It is a perfect replacement for the plain, inflexible, modal APIs which developers are currently limited to.
Also included is the ShellObjects set of components for creating quick launch-like appbars, displaying multiple MSN/Office2003 style popups, wizard UIs, animated tray icons, automatic form resizing, Vista-style task dialogs, system-wide hotkeys, task scheduler library, SingleInstanceComponent, shell file operations, system idle notifications and create and read shortcuts and internet shortcuts.
Shell MegaPack.Net is written in 100% C# managed code; it fully supports Visual Studio 2008 with Net 3.5/3.0 and Vista; it has a royalty-free redistribution license; it has no external dependencies and it comes with comprehensive documentation and numerous samples.